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Most air handler units have fiberglass insulation installed on the interior surfaces to provide thermal insulation, absorb sound, and help to provide the quiet operation of the HVAC system.  As a whole, if properly maintained, air handler insulation has a long-term life expectancy.

In certain instances, the integrity of the fiberglass insulation will degrade and delaminate from the highly varied ranges of temperature, humidity and air turbulence. If the air handler insulation is left unrepaired, raw fiberglass fibers and insulation will enter the air handler components and airstream.

Each time a commercial HVAC system is maintained, the condition of the fiberglass insulation should be evaluated.  If the exposed fiberglass fibers are exposed to the airstream, it is best to remove and replace the air handler insulation, or resurface the damaged insulation with an approved HVAC encapsulate.

Encapsulants, Coatings, & Insulation Repair Products

When fiber glass insulation is initially installed, the exposed face of the fiberglass insulation has a primary seal that locks down the raw fiberglass fibers.  If the primary seal of the air handler unit insulation has begun to delaminate, the most cost effective repair is to encapsulate

Coatings and insulation repair products are designed to repair damaged or degraded HVAC surfaces.  Air handler Insulation repair coatings can range from coatings which lock down the fiberglass fibers to fiberglass coatings that have antimicrobial properties.

Surface treatments for air handler insulation repair must be labeled for the specific use in HVAC&R systems in or on any surfaces that are part of HVAC&R systems, and must be applied to a clean surface.

Air Handler Insulation Replacement

If the air handler insulation requires replacement, it is best to replace the fiberglass insulation with closed cell foam insulation.  Closed cell foam insulation offers many benefits over fiberglass insulation; its finish is smooth and more durable than fiberglass insulation, and resists dirt and moisture accumulation.

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